The extremely aggressive therapy, which kills both cancerous and healthy cells, has been found to increase the chance of cancer cells migrating to other parts of the body. When this happens, the disease is called metastatic cancer, which is the most lethal form.
Chemotherapy gives people the false impression of "curing" the disease. Unfortunately, this is only half of the story. While shrinking primary tumors for some patients in the short term, chemotherapy drugs trigger a mechanism in the body which allows cancer cells to grow back faster and stronger. Most patients receiving chemotherapy are basically trading one cancer for another deadlier form of the disease. Yet, chemotherapy remains the go-to treatment.
For their study, researchers at the Albert Einstein College of Medicine in New York analyzed the effect of common chemotherapy drugs on breast cancer patients. Dr. George Karagiannis and colleagues discovered that two common chemo drugs increased the number of "doorways" on blood vessels.